Mechanical movement



I. C. BUCKMINSTER.

MECHANICAL MOVEMENT.

APPLICATION FILED-MAR. 31. 1919.

1,408,439. Patented Mar. 7, 1922.

UNITED STATES PA'IJENIT OFFICE.

ma 0. BucxmmsrEn, 0F BEVERLY, MAssAomrsET'rs, ASSIGNOR TO UmrEn sue-1;MACHINERY CORPORATION, or PATERSON, NEW JERsEY, A coEroEA'rIoN or mnwJERSEY.

MECHANICAL MOVEMENT.

To ll whom it may concern: I

Be it known that I, IRA C. BUCKMINSTER, a citizen of the United States,residing at Beverly, in the county of Essex and btate of Massachusetts,have invented certain Improvements in Mechanical Movements, of

member rotating about the crank pin as an axis, and means to cause apoint on said member to move to and fro in a straight line, with meansfor causing the direction of the to-and-fro movement to be varied. When.a pitman, or other operated or operating device arranged for movementin a predetermined direction, is connected to the point which moves toand fro, variation in the direction of said to-and-fro movement iseffective to cause greater or less components of said movement to betransmitted to the pitman or other operated or operating member toimpart greater or less movement thereto.

Ordinary eccentric or crank motions impart a predetermined amount ofreciprocation to the driven device or member. Many machines are suchthat it is desirable to increase or diminish the point to which acertaintool or'operating device shall move. For instance, in a type ofheel breasting machines it is desirable to vary the stroke of the knifein accordance with the thickness of the sole.

There are other types of machines which,

for example, operate upon the sole portions of boots and shoes where agreater amount of operation is required at the shank than at pointsbeyond or at the rear of the shank.

The present invention provides improved mechanism whereby an operatingtool, such as a knife, can be given one throw to a given point and thenanother throw to a farther point, or, by way of further illustration, ifthe operating tool be a roll operating upon a shoe bottom, said roll canbe operated first over a given surface-as the shank portion of the shoebottom and then be rolled I Specification of Letters Patent. Patented Ma7 1922 Application filed March 31, 1919. Serial No. 286,511

over greater or less areas so that theshank Fig. 1 represents a sectionthrough the different members of my improved mechanical movement. i

Fig. 2 1s a'vtew' looking from the right of g g. t, partly 1n section onthe line 22 of Fig. is a view similar to a portion of Fig. 2 butillustrating a diiferent form of adusting rack.

Fig. 4 is a diagram illustrating the operation.

A suitably mounted driving shaft 12 is piovided with a crank 13 andcrank pin 14.

ounted upon the crank pin is an eccentric 15 which, however, mightobviously be a crank. Compounded with the eccentric 15 or integraltherewith is a pinion 16. In the particular embodiment of the inventionillustrated, the pinion and eccentric are rig- 1dly secured together, asby means .of one or more locking pins 17. For better purposes ofillustration of the operation, the i398 gf the crank pin is indicated at18in having a pitman 20 which, it is to be understood, is toreciprocally transmit motion to any tool or piece of mechanismthe throwof which is to be varied. Preferably bearing rollers. 21 are providedbetween the eccentric 15 and crank pin 14, and bearing" rollers 22 areprovided between the eccentric 15 and the sleeve 19.

Mounted in suitable bearings is a shaft 23 in alinement with the shaft12, said shaft 23' carrying a hub 24 having arms 25 the outer endsofwhich carry a ring 26 having internal teeth 27 and external teeth 28.The internal teeth 27 are twice the number of the teeth of pinion 16. Inother words, the diameter of the pinion 16 equals the radius of theinner circle of the ring 26.

The ring 26 is rotatably adjusted by any suitable means. One way mightbe by partially rotating the shaft 23 which carries said ring, but inFig. 2 'I have indicated a worm 29 meshing with the external teeth 28 ofthe ring 26, said worm being mounted in 3 the eccentric,

whereby the worm may be rotated as by a suitable handle 31. The worm isnot freely rotatable, that is, it can not be rotated by any actiontransmitted to it by a tendency of the ring 26 to rotate. The worm isintended simply to shift andvhold the ring 26 in any position ofrotation relatively to the] axis of the shaft 23 that may be desired. pV

In Fig. 3 the means for rotatably adjustin the ring 26 comprises a rack32 mounted Y to' e adjusted endwise in supporting guides 33. By means ofa pin 34 projecting from. the rack and a link 35 which may be connectedto any pattern or control mechanism such as the cam of the machine inwhich the mechanical movement is employed, the rack crank pin 14 rotatesin one direction the pin ion 16, and the eccentric 15 are carried aroundby the crank pm, but sal pinion and eccentric rotate in the oppositedirection on the axis 18 and for each complete rotation of the crankpin, the pinion is rotated once and carries the eccentric with it andconsequently "reciprocates the pitman 20. I

The operation is as follows Assuming that the adjustment of the ring 26is such-that the parts occupy the relative positions shown in Figs. 1and 2, and that rotation of crank 13 starts clockwise in Fig. 2, thenthe engagement of the pinion 16 with the inner teeth 27 of ring 26causes said.pinion and the eccentric 15 which is fixed thereto to rotateanti-clockwise about the translatin axis 18, but the center a: of

i ollows the path indicated by line a: 3/ in Fig. 4, giving a maximumthrow to the pitman. Supposing the mechanism is stationary, anyadjustment of the ring 26 in either direction from the Fig. 2 positioncauses the' pinion and eccentric toturn on the crank pin 14: and drawthe-center w toward the axial line of power shaft 12, thus reducing theextent of throw of the pitman,

when the mechanism is started. This reference to adjusting while themechanism'is not vin operation is toaid an understanding -man is alwaysvertical in said figure.

tal circle. In the particular embodiment of the invention exemplified inthe drawin the eccentric ,15 is rigidly carried by t e I circle so thata point thereof (e., g. the center w of the eccentric) describes avhypoc cloid in practically a straight line since t e diameter of thegeneratin circle (16) equals the radius 7 of the fun amental cir- Inpractice the parts are so mounted or arranged that the direction ofthrust and pull of the, pitman 20 is determined. Therefore, if thehypocycloid be in line with that direction of thrust, the throw will bemaxi-' mum and if'inclined relatively thereto the throw will be reducedin proportion to the degree of inclination.

For purposes of description, assume that the center of the-eccentric 15is the point of the generating circle indicated at a: or w or w" in thediagram Fig. 4; that in said figure, 27 denotes the fundamental circle;'that the three dot and dash circles a, b, 0 represent differentpositions which the ncrating circle may occupy at the start. 0 anoperation, said different positions being controlled by rotativelyadjusting the ring 26; and that the direction of motion of the itowif,.at the start, the center of eccentric '15 is at w, it will, duringeach complete rotation of shaft 12, travel across the diameter of 27 to3 and back again, thereby im art-ing maximum throw to the pitman an'whatever machine element is operated thereb illustrated by the line 1.If the ring be a 5 justed so that, at the start, the center of theeccentric is at at, each complete rotation of the shaft will cause thatpoint to travel across to 3 and return, thereby imparting a lesser throwindicated by the'line 2. If the 1 ring be adjusted so that, at thestart, the center of the eccentric is at-m, each complete rotation ofthe shaft will cause that point to travel across to y" and retulfn,thereby substantially stopping reciprocatihg 115 motion of the pitmanwithout disconnecting driving power from shaft 12.

Any desired throw of the pitman between maximum and minimum can beobtained by so adjustin the ring 26 that, at the start, 120 the center0% the eccentric occupies any intermediate oint between a: and m, andthis can be e ected while the machine is in operation,

By the term ring employed herein and 125 in the claims, I do not mean tolimit myself to the illustrated shape of the member 26 further than thatits internal toothed portion is circular. Of course when a worm 29 orrack 32 is employed to adjust the mem- 13 ber 26, the latter has acurved toothed outer portion to co-operate with the worm or rack. Ifother means for rotatively adjusting the member 26 should be employed,the outer configuration of said member 26 would possess no significance.For instance, if the pin 34: in Fig. 3 should be carried by the member26, then the link 35 could be employed to actuate said member rotativelyand the latter could have any external shape that might preferably begiven thereto.

' Inasmuch as the mechanical element known as an eccentric is but a formof crank, I desire to be understood as not limiting myself to astructure in which the diameter of the member 15 is larger than itsthrow. If of less diameter it would be properly termed a crank.

Having described my claim 1. A mechanism for converting rotary intoreciprocatory motion, comprising an internally toothed ring, means forrotatively adjusting said ring, a pinion, means for invention, I

traversing the pinion in a circular path with its teeth in engagementwith the teeth of said ring, and an actuator carried by said pinion.

2. A mechanism for converting rotary into'reciproeatory motion,comprising an internally toothed ring, means for rotatively adjustingsaid ring, a pinion the diameter ment with the teeth of said of which isone-half the internal diameter of the ring, means for traversing thepinion in a circular path with its teeth in engagering, and an actuatorcarried by said pinion.

3. A mechanism for converting rotary into reciprocatory motion,comprising an internally toothed ring, means for rotatively adjustingsaid ring, a pinion having onehalf as many teeth as said ring, means fortraversing the pinion in a circular path with its teeth in engagementwith the teeth of said ring, and an actuator carried by said pinion.

4. A mechanism for converting rotary into reciprocatory motioncomprising a shaft having a crank pin, a inion mounted on the cran pin,an interna 1y toothed ring having its teeth engaging said pinion, saidring being rotatively ad ustabIe on an axis in alinement with saidshaft, and an actuator for a reciprocatory element, said actuator beingrigidly carried by said pinion.

5. A mechanism for converting rotary into reciprocatory motioncomprising a shaft having a crank pin, a pinion mounted on the crankpin, a ring having internal teeth en aging said pinion, said ring beingrotative adjustable on an axis in alinement with said shaft, aneccentric carried by said pinion, and a reciprocatory member to beactuated by said eccentric.

6. A mechanism for converting rotory into reciprocatory motioncomprising a shaft carrying an eccentrically mounted pinion, aneccentric connected to said pinion to be rotated about the axis of saidpinion, a reciprocatory member adapted to be actuated by said eccentric,and a rotatively adjustable ring gagement wlth the teeth of the inion.

7. A mechanism for convertlng rotary into reciprocatory motioncomprising a, shaft having a crank pin, a pinion mounted on said crankpin, an eccentric carried by the pinion, a ring having internal teeth inengagement with the pinion, said ring being mounted to be adjusted on anaxis in alinement with the axis of the shaft, and means for adjustingsaid ring and holding it in adjusted position.

8. A mechanism for transmitting rotary into reciprocating motion or thereverse, comprising a crank, a crank pin, a member rotating about thecrank pin as an axis, means to cause a point on said member to move toand fro in a straight line, and means for changing the direction of saidto and fro movement.

9. A mechanism for transmitting rotary into reciprocating motion or thereverse, comprising a crank, a crank pin, a member rotating about thecrank pin as an axis, means to cause a oint on said member to move toand fro in a straight line, means for changing the direction of said toand fro movement, and means for utilizing a component of said movementin a predetermined direction.

, 10. A mechanism for transmitting rotary into reciprocating motion orthe reverse, comprising a crank, a crank pin, a member rotating aboutthe crank pin as an axis, means to. cause a point on said member to moveto and fro in a straight line, a pitman connected to said member at saidpoint, and means to cause greater or less components of said straightline movement to be effective to reciprocate the pitman in a givendirection.

11. A mechanism for transmitting rotary into reciprocating motion or thereverse, comprising a crank, a crank pin, a member having internal teethin enrotating about the crank pin as an axis, 4

means for causing two rotations of said member for each rotation of thecrank to cause a point on said member to move to and fro in a straightline, a itin an connected to said-member at sai point, and

means to cause greater or less components of IRA C. BUCKMINSTER.

